void write_to_log (char *, int);void build_linked_list (char *, int, struct DHCP_MESSAGE *);void print_linked_list_contents (struct DHCP_MESSAGE *);float generate_rand (void);int calculate_initial_delay (void);float calculate_retransmission_timeout (float, float);int check_for_option (int, struct DHCP_MESSAGE *);int check_for_status (struct DHCP_MESSAGE *);int check_message (struct DHCP_MESSAGE *, int, int);struct DHCP_MESSAGE ** wait_until_response (int, int, float, float, int, int, int, char *, int, int *);u_int8_t convert_character_to_hex (char);void generate_trans_id (u_int32_t *);int store_in_buffer (struct DHCP_MESSAGE *, char *);void read_option (char *, int, int, struct OPTIONS *);void free_message_mem (struct DHCP_MESSAGE *);u_int8_t get_preference_value (struct DHCP_MESSAGE *);u_int8_t * get_pref_ipv6_address (struct DHCP_MESSAGE *);u_int32_t get_pref_lifetime (struct DHCP_MESSAGE *);struct DHCP_MESSAGE * select_server (struct DHCP_MESSAGE **, int, char *);struct DHCP_MESSAGE ** purge_message (struct DHCP_MESSAGE **, struct DHCP_MESSAGE *, int *);struct OPTIONS * get_options_ptr (struct DHCP_MESSAGE *, int);int check_address_in_use (struct OPTIONS *);void set_ipv6_address (struct OPTIONS *, char *);void unset_ipv6_address (struct OPTIONS *, char *);struct OPTIONS * copy_message_option (struct DHCP_MESSAGE *, int);void get_timers (struct DHCP_MESSAGE *, u_int32_t *, u_int32_t *, u_int32_t *);int check_reply_message (struct DHCP_MESSAGE *, int);char ** get_all_interfaces (char *, int *);void copy_duid1 (struct DUID1 *, struct DUID1 *);void copy_duid2 (struct DUID2 *, struct DUID2 *);void copy_duid3 (struct DUID3 *, struct DUID3 *);int check_for_duid_match (struct OPTIONS *);int check_duid1 (struct DUID1 *, struct DUID1 *);int check_duid2 (struct DUID2 *, struct DUID2 *);int check_duid3 (struct DUID3 *, struct DUID3 *);